Grinding machine



May 3, 1932.

C. C. GIBSON GRINDING MACHINE Filed July 29 1929 5 Sheets-Sheet gwlwmhzw 6: 6 2555071 y 1932. c. c. GIBSON 1,856,808

GRINDING MACHINE Fi led Jfil 29, 1929 5 Sheets-Sht 2- May 3, 1932. c. c. GIBSON 1,856,808

GRINDING momma Filed July 29, 1929 3 Sheets-Sheet 3 9 n M 4 III I...

Ill/IllI/l/I/l/lI/I ll k Patented May 3, 1932 UNITED STATES PTET CARSON G; GIBSON, OF HAMBURG, IOWA, ASSIGNOR TO TWO WAY ELECTRIC GRINDER 7 COMPANY, OF HAMBURG, IOWA GRINDING IMAGHI'NE Application filed July 29,

This invention relates to grinding machines, and has for one of its objectslto provide a novel, simple and highly eflicient means of this character which'shall be especially adapted to be used for the purpose of sharpening the perforated discs and starshaped cutters of sausage meat grinding machines and for the purpose of sharpening butcher knives and the like.

To attain the foregoing and other objects, the nature of which will appear as the description proceeds, the invention comprehends the provision of a machine of the character stated which shall embodyan electric motor; an emery wheel fixed to the armature shaft of the motor, means adapted to rotatably support the-disc or cutter and rockably mounted to move the rotating disc-or cutter backwardly and forwardly across the peripheral face of the emery wheel, and means operable from the armature shaft of the motor for rotating the disc or'cutter and for rocking the supporting means therefor.

The invention further comprehends the provision of a machineof the character stated wherein the electric motor shall be mounted for adjustment in a direction t0= permit the emery wheel to be moved invthe direction of the rotating and swinging disc or cutter as the grinding operation advances.

The invention further comprehends the provision of a machine of the character stated wherein the electric motor and the supporting means shall be mounted to effect the rotation of the emery wheel and the rotation and swinging of the disc or cutter in right angularly related vertical or substantially vertical plates, and wherein the electric motor shall he so mounted that. it may be adjusted to support the emery'wheel in a substantially horizontal plane, to the end that the lateral face of the emery wheel may be conveniently employed for the pur ose of sharpening butcher knives and the like.

The invention further comprehends the provision of a machine of the character stated wherein the several parts thereof shall be so compactly arranged that the machine will take up but little space upon a counter of a butcher shop or the like,rwhich shall embody 1930.- Serial No. 471,504.

a housing for the major portion of the means for rotating the disc or cutter and for rocking the supporting means therefor; and wherein the electric motor shall be mounted upon the casing for adjustmentto advance the emery wheel in the direction of the disc or cutter and for adjustment to arrange the emery Wheel in substantiallyhorizontal:position.

The invention is hereinafter more fully described and claimed,- and illustrated in the accompanying drawings, wherein igure 1 is a view in front elevation of the grinding machine;

Figure 2 is a sectional view taken on a plane extending horizontally and centrally through the housing of the grinding machine;

Figure?) is'a sectional view taken on the planes indicated by'the line 33 of Figure 1;

Figure dis a sectional view taken on a plane extending vertically through the housing and the motor carrying plates;

Figure 5 is a view in rear elevation of the grinding machine with the emery wheel arranged in substantially horizontal position;

Figure 6 is a detail view illustrating the application-of a cutterto the rotating and oscillating mandrel of the grinding machine, and

Figure 7 is a sectional view taken on a plane extending vertically and centrally through the cutter.

The grinding machine comprises a housing 1 which is mounted upon a base 2 and which comprises front and rear portions 3 and 4, respectively, of different height. The housing portion 3 extends above the housing portion 4. The housing'portion 3 has'a horizontal top wall 5 and the housing portion 4 has a downwardly and forwardly inclined top wall 6. A horizontal main shaft 7 is rotatably supported in and extends longitudinally of the housing 1. The left-hand end of the shaft 7 extends beyond the housing 1 and fixed thereto is a grooved pulley 8. The right-hand end of the shaft 7 is located within the housing 1, and fixed thereto is a bevel gear 9. A vertical jack shaft 10 is rotatably supportedin the housing 1 at a point located rearwardly beyond the shaft 7 and between the ends thereof. A horizontal or low speed shaft 11 is rotatably supported in and extends transversely of the housing 1, and it is located above the shaft 7 and rearwardly of the shaft 10. A worm 12 fixed to the shaft 7 meshes with a worm gear 13 fixed to the shaft 9, and a worm 14 fixed to the shaft 10 meshes with a worm gear 15 fixed to the shaft 11. The shaft 11 extends beyond the rear side of the housing 1, and fixed to the rear end thereof is a disc 16 provided with a wrist pin 17.

A hearing block 18 is fixed within the housing 1 rearwardly of the front end portion of the shaft 7, and is provided with a reduced extension 19 which passes through the rear wall of the housing. The extension 19 is formed to provide a journal 20 at the ends of which are located annular shoulders 21 formed integrally with the extension. The horizontal shaft 22, which is journaled in the block 18 and its extension 19, is arranged at right angles to the shaft 7, and is provided at its front end with a bevel gear 23 which meshes with the bevel gear 9. The rear end of the shaft 22 extends rearwarclly beyond the extension 19, and fixed thereto is a grooved pulley 24. v

A support 25 for an electric motor 26 and resting upon the top wall 5 of the housing 1, comprises a bottom plate 27 and a top plate 28. The bottom plate 27 is pivoted at its lefthand end, as at 29, to the housing 1, to the end that the support 25 may be swung from its normal horizontal position upon the housing 1 into a substantially vertical position. The support 25 is adapted to be supported in its substantially vertical position by a folding brace 30 which is pivoted, as at 31, to the housing 1 and which is pivoted, as at 31, to the bottom plate 27. The motor 26 rests upon the top plate 28, and is fixed to this plate, as at 32. The motor 26 is arranged with its armature shaft 33 parallel to the main shaft 7. A grooved pulley 34 is fixed to the rear end of the armature shaft 33, and passing about this pulley and the pulley 8 on the main shaft 7 is a belt 35. An emery wheel 36 is fixed to the front end of the armature shaft 33 and overlies the top wall 6 of the housing 1.

The bottom plate 27 is provided at its upper side with a recess 37 which extends from the front to the rear edge thereof and has its side walls under cut, as at 38. The top plate 28 is provided at its under side with ribs 39 which extend from the front to the rear edges thereof and are arranged in the recess 37. The remote side edges of the ribs 39 are beveled, as at 40, and such side edges contact with the inclined walls 38 of the recess 37 to hold the top plate 28 against upward movement with respect to the bottom plate 27 and to connect these plates so that the top plate may be adjusted forwardly and rearwardly with respect to the bottom plate. A screw 41 located in the recess 37 and extending from the front to the the top plate 28 engages in an annular groove 45 in the nut 43. The screw 41 is provided at its front end with a hand wheel 46 through the medium of which it is turned when it is desired to adjust the top plate 28 forwardly or rearwardly with respect to the bottom plate 27, the nut 43 and lug 44 establishing such a connection between the top plate and screw that the turning of the latter will result in movement of the former.

An arm 47 provided at its lower end with a split bearing 48 and in its upper end with a similar bearing 49, is pivotally connected through the medium of its bearing 48 to the journal 20 of the bearing block extension 19, the arm being mounted for rocking movement in a vertical plane parallel to the vertical plane in which the emery wheel 36 is located.

A hollow arbor 50 is journaled in the hearing 49, and isprovided at its front end with a head 51 and at its rear end with a grooved pulley 52. The arbor 50 is arranged parallel to the shaft 22 and swings about this shaft as an axis. The peripheral grooves of the pulleys 24 and 52 are of .V-form in cross section and connecting these pulleys is a belt 53 of similar form in cross section.

The perforated disc 54 or the star-shaped cutter 55 of the sausage meat grinding machine is adapted to be secured against the front side or face of the head 51 of the arbor 50, the head being provided with a recess 56 for the reception of the hub 57 of the disc or for the reception of the hub 58 of the cutter.

A bolt 59 passes through the arbor 0, and y is provided at its front end with a head 60 and at its rear end with a nut 61. The bolt .59 is adapted to secure either the disc 54 or the cutter 55 against the face of the head 51. When the disc 54 is applied to the head 51, the bolt 59 passes through its hub 57, and the head 60 of the bolt engages in the front end of the hub. WVhen the cutter55, is applied to the head 51, the bolt 59 passes through its hub 58, and the head 60 of the bolt engages in the front end of the hub. The bolt 59 is drawn rearwardly of the head 51 through the medium of the nut 61 which bears against the rear end of the arbor 50. A pin 62 extending forwardly from the face of the head 51 enters one of the openings 63 of the disc 54 when he disc is applied to the head 51. to the end that the disc will be connected to the head for rotation therewith. When the cutter 55 is applied to the head 51, the pin 62. contacts with one of the arms 64, to connect the cutter to the head for rotation therewith, the arms carrvin g the blades 65 of the cutter.

The arm 47 is connected to the wrist pin 17 by a rod 66 which comprises parts 67 and 68 telescopically associated and axially adjustable through the medium of a nut 69 threadedly engaged with both parts. The rod part 67 is connected to the wrist pin 17, and the rod part 68 is pivotally connected, as at 70, to the arm 47. As the rod parts 67 and 68 are adjustable axially, the length of the rod 66, and consequently the angle of the rocking movement of the arm 47, may be varied.

A switch 71 is secured to the front side of the housing 1. Conductors, not shown, and arranged in a protective casing 72, extend from the switch 71 to the brushes of the motor 26. Conductors, not shown, and arranged in a protective casing 73 are connected to the switch 71 and to a plug 74 adapted to be engaged with a wall or other electric outlet socket.

A guard 75 in substantially semi-circular formation, is arranged in rear of the peripheral face of the emery wheel 36, and is secured, as at 76, to a down-turned flange 77 at the right hand edge of the top plate 28, the guard being also secured, as at 78, to the motor 26.

In practice, the article to be sharpened, such for instance as the disc 54 or the cutter 55 is secured to the mandrel head 51, the motor 26 is adjusted rearwardly through the medium of the screw 41 to bring the peripheral face of the emery wheel 36 in contact with the article, and thereafter the switch 71 is closed. The motor 26 drives the shaft 7, the shafts 11 and 22 are driven by the shaft 7, the arm 47 is oscillated or rocked by the shaft 11, and the mandrel 50 is driven by the shaft 22.

The article to be sharpened is moved in op- )OSl'fQ directions across the peripheral face of the rotating emery wheel 36, and the article is at the same time rotated, and as the sharpening operation advances, the motor 26 is adjusted to maintain contact between the emery wheel and the article. The extent of the movement of the article in each direction with respect to the peripheral face of the emery wheel 36 is equal to the diameter of the perforated portion of the disc 5e and equal to the length of the blades of the cutter 55.

hen the grinder is not being used for the purpose of sharpening the discs and cutters of sausage meat grinding machines, it may be used for the purpose of sharpening butcher knives and the like. To adapt it for this use, the support 25 is swung upon its pivots 29 to carry the emery wheel 36 into a substantially horizontal position. The emery wheel 36 is maintained in this position by the brace 80, and when in this position, its lateral face may be used for the purpose of sharpening butcher knives and the like. When the emery wheel 36 is in this position, the motor 26 is not operatively connected to the main shaft 7. and due thereto, the arm 47 and mandrel head 51 will not be rotated.

While I have described the principle of the invention, together with the structure which I now consider the preferred embodiment thereof, it is to be understood that the structure shown is merely illustrative and that such changes may be made, when desired, as fall within the scope of the invention as claimed.

I claim 1. A grinding machine, comprising an electric motor, a grinding wheel fixed to the armature shaft of the motor, means supporting the motor for adjustment to arange the grinding wheel in a vertical or horizontal position, means adapted to rotatably support the article to be sharpened and rockaloly mounted to move the article in opposite directions across the peripheral face of the grinding wheel when said wheel is in vertical position, means operable to rotate the article and rock the article supporting means and including a shaft, and means establishing a driving connection between the armature shaft and said last shaft removably connected to one of such parts to free the motor for adjustment to arrange the grinding wheel in horizontal position.

2. A grinding machine, comprising an electric motor, a grinding wheel fixed to the ar mature shaft of the motor, a journal, an arm pivotally connected at one end to the journal, an arbor rotatably mounted in the free end of the arm and adapted to carry an article to be sharpened, a shaft rotatably mounted in the journal and driven from the motor, means establishing a driving connection between said second shaft and arbor, and means operable by the motor for rocking the arm to move the article in opposite directions across the peripheral face of the ginding wheel.

3. A grinding machine, comprising an electric motor, a grinding wheel fixed to the armature shaft of the motor, a journal, an arm pivotally connected at one end to the journal. an arbor rotatably mounted in the free end of the arm and adapted to carry an article to be sharpened, a shaft rotatably mounted in the journal and driven from the motor, means establishing a driving connection between said second shaft and arbor, a third shaft carrying a wrist pin and operable by the motor, and a rod connecting the wrist pin and arm.

4. A grinding machine, comprising an electric motor, a grinding wheel fixed to the armature shaft of the motor, a journal, an arm pivotally connected at one end to the journal, an arbor rotatably mounted in the free end of the arm and adapted to carry an article to be sharpened, a shaft rotatably mounted in the journal and driven from the motor, means establishing a driving connection between said second shaft and arbor, a third shaft carrying a wrist pin and operable by the motor, and a rod adjustable as to length and connected to the Wrist pin and arbor.

5. A grinding machine, comprising a plate mounted for adjustment into a horizontal or substantially vertical position, means for supporting the plate in said first position, means for supporting the plate in said second position, a second plate slidably supported by said first plate, means for moving the second plate With respect to the first plate and securing it against accidental movement with respect thereto, a motor fixed to the second plate, a grinding Wheel fixed to the armature shaft of the motor, a rotatably mounted arbor adapted to carry an article to be sharpened, and means operated by the armature shaft for rotating the arbor.

In testimony whereof I hereunto afiix my signature.

CARSON C. GIBSON. 

